Public bug reported:
As part of its conformance test suite, Wine tests the behavior of the
Windows console API. Part of this test involves opening a test console
and scrolling things around. The test probably does not need to perform
that many scroll operations to achieve its goal. However as is it
illustrates a significant performance issue in QEmu. Unfortunately it
does so by timing out (the tests must run in less than 2 minutes). Here
are the run times on a few configurations:
10s - QEmu 1.4 + Q9450@2.6GHz + Windows XP + QXL + QXL driver
8s - QEmu 1.12 + Opteron 6128 + Windows XP + QXL + QXL driver
127s - QEmu 1.12 + Opteron 6128 + Windows 7 + cirrus + vga driver
127s - QEmu 1.12 + Opteron 6128 + Windows 7 + QXL + QXL driver
147s - QEmu 1.12 + Opteron 6128 + Windows 7 + vmvga + vga driver
145s - QEmu 1.12 + Opteron 6128 + Windows 7 + vmvga + vmware driver (xpdm, no
better with all graphics effects disabled)
10s - Metal + Atom N270 + Windows XP + GMA 950 + Intel driver
6s - Metal + i5-3317U + Windows 8 + HD4000 + Intel driver
3s - VMware + Q9450@2.6GHz + Windows XP + vmvga + vmware driver
65s - VMware + Q9450@2.6GHz + Windows 7 + vmvga + vmware driver
So when running on the bare metal all versions of Windows are about as
fast. However in QEmu Windows 7 is almost 16 times slower than Windows
XP! VMware is impacted too but it's still maintains a good lead in
performance.
Disabling all graphics effects did not help so it's not clear that the
fault lies with Windows 7's compositing desktop window manager. Maybe it
has to do with the lack of a proper wddm driver?
** Affects: qemu
Importance: Undecided
Status: New
** Attachment added: "Test executable and source"
https://bugs.launchpad.net/bugs/1119861/+attachment/3521476/+files/console.tar.bz2
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https://bugs.launchpad.net/bugs/1119861
Title:
Poor console performance in Windows 7
Status in QEMU:
New
Bug description:
As part of its conformance test suite, Wine tests the behavior of the
Windows console API. Part of this test involves opening a test console
and scrolling things around. The test probably does not need to
perform that many scroll operations to achieve its goal. However as is
it illustrates a significant performance issue in QEmu. Unfortunately
it does so by timing out (the tests must run in less than 2 minutes).
Here are the run times on a few configurations:
10s - QEmu 1.4 + Q9450@2.6GHz + Windows XP + QXL + QXL driver
8s - QEmu 1.12 + Opteron 6128 + Windows XP + QXL + QXL driver
127s - QEmu 1.12 + Opteron 6128 + Windows 7 + cirrus + vga driver
127s - QEmu 1.12 + Opteron 6128 + Windows 7 + QXL + QXL driver
147s - QEmu 1.12 + Opteron 6128 + Windows 7 + vmvga + vga driver
145s - QEmu 1.12 + Opteron 6128 + Windows 7 + vmvga + vmware driver (xpdm, no
better with all graphics effects disabled)
10s - Metal + Atom N270 + Windows XP + GMA 950 + Intel driver
6s - Metal + i5-3317U + Windows 8 + HD4000 + Intel driver
3s - VMware + Q9450@2.6GHz + Windows XP + vmvga + vmware driver
65s - VMware + Q9450@2.6GHz + Windows 7 + vmvga + vmware driver
So when running on the bare metal all versions of Windows are about as
fast. However in QEmu Windows 7 is almost 16 times slower than Windows
XP! VMware is impacted too but it's still maintains a good lead in
performance.
Disabling all graphics effects did not help so it's not clear that the
fault lies with Windows 7's compositing desktop window manager. Maybe
it has to do with the lack of a proper wddm driver?
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